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PSA-graded 2021 Topps Inception Ryan Mountcastle Orioles rookie card with blue ink autograph in a protective slab
Baseball card in a protective case with a PSA label; features Ryan Mountcastle rookie autograph card from 2021 Topps Inception Baseball and a 'Congratulations' card message inside the case.

2021 Topps Inception Emerging Stars Green #RM Ryan Mountcastle /125 PSA 10

2021 Topps Inception Emerging Stars Green Ryan Mountcastle Auto /125 – PSA 10 GEM MINT – Signed Rookie Card

An outstanding signed rookie card from the 2021 Topps Inception Emerging Stars Green parallel set featuring Ryan Mountcastle. Known for its premium design, vibrant artwork, and limited production, Inception remains one of the hobby’s most popular modern releases. This Green parallel is serial numbered to just 125 copies and features Mountcastle’s certified autograph, adding both scarcity and collector appeal. Graded PSA 10 GEM MINT, the card offers pristine condition with exceptional eye appeal, sharp corners, and flawless surfaces. Mountcastle quickly established himself as one of the key young power hitters in the Baltimore Orioles organization and a cornerstone of the club’s emerging core.

  • Year: 2021
  • Set: Topps Inception
  • Subset: Emerging Stars Green
  • Player: Ryan Mountcastle
  • Team: Baltimore Orioles
  • Serial Number: /125
  • Grade: PSA 10 (GEM MINT)
  • Designation: Signed Rookie Card

A gem mint autographed rookie numbered to just 125 copies from one of Topps’ premier modern releases — a standout addition to any Orioles or contemporary rookie card collection. HOFSR

$139.99

1 in stock

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Brent S.
Brent S.
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Working with Dennis at H.O.F. Signed Rookies has been fantastic. He’s highly knowledgeable, always answers my questions, and I’ve already received my signed and slabbed cards. I’m thrilled to have found him and highly recommend his services!
James H.
James H.
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@slamdunkcollector
H.O.F. Signed Rookies was a fantastic experience! They helped me land a hard-to-get autograph that turned out amazing. Communication was top-notch, every question answered quickly, and their service earned my full trust. I’ve already sent in more cards for future signings. As a longtime collector, I fully recommend them.
Aaron P.
Aaron P.
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@aaronisapayne
Great company to work with! My cards came back graded well above what I was hoping. I'll definitely be sending all my cards here to get prepped for now on. Great communication, great service!
Chris C.
Chris C.
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@cart_is_wright
H.O.F. Signed Rookies treated my cards with great care and professionalism, ensuring they were well-protected and arrived in perfect condition. Their expertise, attention to detail, and secure packaging set them apart. I highly recommend them for grading, valuation, or expanding your knowledge of sports card collecting!
John M.
John M.
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@packripperjohnni
I highly recommend H.O.F. Signed Rookies for anyone looking to get their cards autographed and graded. Their all-in-one submission service makes the process seamless—just send your card, and they handle the autograph, prep, and grading from start to finish. Their professionalism, expertise, and attention to detail ensure top-quality results, and their communication is always clear and responsive. If you want trusted results without the hassle, HOFSR is the way to go!
Ben P.
Ben P.
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Hopkinsville, KY
As a multi-player autograph collector, I wanted someone I could trust with my cards. Finding Dennis at HOFsignedrookies.com has been perfect. The process is smooth, communication is excellent, and my cards are handled with real care and attention. With already-signed star pieces, trust was my biggest concern—and HOF Signed Rookies has exceeded expectations. Great service, great value. Excited to continue working together.
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Jake F.
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@baseballnerdist
When it comes to sentimental or financially valuable cards, sometimes you need an extra set of eyes and hands to make sure everything’s perfect before grading. H.O.F. Signed Rookies is the place to go. Their communication is excellent, and they do a fantastic job of bringing out the full potential of every card.
Joe M.
Joe M.
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@steelers_card_fella
I recently used H.O.F. Signed Rookies for a Steelers signing I couldn’t attend and was thoroughly impressed. Dennis was professional, responsive, and addressed all my detailed questions throughout the process. The team carefully prepped my cards, ensured they were signed in the correct spot, and even submitted them for grading. This white-glove service is exactly what I look for in handling my collection.
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Brian R.
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Hall of Fame Signed Rookies is a collector’s dream! Their selection of sports cards and memorabilia is outstanding, and their card preparation service for grading submissions is top notch. I would highly recommend checking them out!
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Brad C.
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@bradcostilo
Couldn’t be happier with the deal that we worked out! Thank you for the signed Koufax RC, which is a cornerstone piece of my collection!.
Charles J.
Charles J.
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Aurora, IL
Excellent communication from start to finish. The signing dates don't get postponed. Will continue to order.
Nick B.
Nick B.
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Fort Dodge, IA
HOF Signed Rookies did a great job with my item at the Rod Carew signing at a price much cheaper than others were offering. I would absolutely use them again in the future for my items. Very satisfied with my experience. Thank you!
Tom B.
Tom B.
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Glendale, AZ
I would highly recommend HOFSR for their professionalism and exceptional customer service in helping me get my Rod Carew bat signed by Mr. Carew. The entire process went smoothly, and I couldn’t be more pleased with the result! You can trust that they will take excellent care of any item you submit for signing. Thank you.
Brett K.
Brett K.
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@bmk007
Great service - I have submitted multiple cards for auto and grading over the past year. I am very pleased with the results. HOFSR took great care of my cards. Worth the wait for their high-end services. Recommended!