What iteration of Rolling Block is this frame and what evidence do you have that it is pre-'98? There were at least 5 revisions to the RB design and IIRC they were manufactured from the 1860s (definitely antique) to the 1910s (not antique).
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In general terms Antique is 100 years. For gun sales it must be pre1898. Muzzle loaders including Cap and ball revolvers old or new ship to your door no background check. Your state may differ but even in California this is true. Under Federal law they are not "Fire arms". -- Check this out. I want one! (I like them black) https://americanguncraft.com/products/