Are you sure it's hammerless and not pocket hammer? Your stated model and caliber do not add up...
Hammerless would usually be in 32acp or 380acp - dime a dozen, prohibited and cheap around 2-300 at auctions - condition is everything, of course...
Now Pocket Hammer is in 38acp - and I think this is what you likely meant since they are more rare - latest auctions indicate that they came down in price - as low as 800, used to be up to 1300 a couple years back. For a 5/10 I'd say 800 is fair enough.