Germanow-Simon (GS) Brand PKH/PK Acrylic Crystal w/Step for Easy Fitting . Select the size of the one you are ordering.

Both PKH and PK are pocket watch crystals for open faced pocket watches.  PKH crystals have a higher dome than the PK crystals.

Items are new old stock (unused in the original envelopes) but please note these envelopes shows aging and storage wear.