The 0634-5001 digtial chrono was originally for the Japanese domestic market (I believe) I bought this to complete the set of 0634 in my collection. I paid £34.00 uk in 2018 and the seller on eBay said it was spares and repairs. Once received although the crystal is in poor condition the rest of the watch was fine. It had stuck pushers one of which would not operate the function. I found some battery leakage too. Once I cleaned it all up. removed the pushers, cleaned and then re-oiled the watch is now in fine working order. I am now on the lookout for a nice crystal!