I have never seen a crossbolt behind the sling swivel originally fit to any Mauser sporter and I have never seen a true TypeA with a rounded grip. I would venture that the mods on this particular rifle preclude it from being a true TypeA at all.
Sounds like something that will require more investigation.
In my experience, only the high grade original Oberndorf Mausers demand premium prices, TypeA's being at the top of the market.
Can you share pictures or a link to the rifle in question so we can see what you are talking about?