hi everyone, new to these forums so not sure posting in correct place, but hoping for some help. we recently moved house and in the spare room we found a meopta, opemus iii. it looks in immaculate condition, still in case and as far as we can tell all parts still in case. the key is unfortunately missing but used a bobby pin (hair grip) to gently open it. was just wondering if anyone knows if these are worth anything or where we can sell it as it is of no use to me or my partner. thanks in advance