Hello everyone, So I recently pick up this little gem at a local pawn shop. The movement is a cal.560. While cleaning it up I noticed the crystal was cracked; it did not have an omega logo. So my question is this, being an American case did it have an omega branded crystal? Also what would the crystal be for this one and if it had a tension ring (the one it had did not have a tension ring)? Would a generic crystal be ok. Thanks I'll post an update when completed