Well if its posh its landed in bandit country lol. I'm not sure the implications of finding those two screws there but would guess its a more refined trigger that is more adjustable. If that's the case I'm going to disappoint us both as there are no screws there. Despite that the trigger is growing on.me and I've deffo put up with worse.
I'll need to.dig out some old mags to track down this particular model on sale back in the day to get a feel for where the gun sat in.the hierarchy of the Diana range back then.Its clearly a youth/ starter gun, but its a little cracker I must say.