I have had this M! and liner fr about a year, but after finding this forum, i am realy interested in collecting these things. I got this at a flea market for $10.00 total.

It does have the front seam. The stamp on th einside of the rim of the shell looks like 38??

As for the liner, i can barely make out the stamp. IT has the number 2 and it looks to be a double stamp as it is not clear. The straps have the number 17 stamped on them and there is a yellow "F" stamp below the nap strap

I would like to know your pinion n it and the estimated value and rarity. here are some pictures.