Hi Max,
I do not collect tsuba and have no opinion on the forging age of this piece, just wanted to add that people often underestimate how fine the craft of modern (not even contemporary) massively made copies can be. One can often find, as Vajo pointed out, poorly made cheap (~10 USD) tsuba and conjecture that all copies are poorly made, but even in the 19th century there were 浜物 decent enough to camouflage itself into a purely handmade one. I suggest that the best strategy to avoid such a loss is to watch long sufficient before purchasing to establish one's own standard as to what is good enough and what is not, in this case, maybe even post on this forum before purchasing.
I hope this little setback will not prevent you from your tosogu adventure.
C. C.