ALPHA Jumping Hour Limited Edition Gents Dress Watch Ref. 623-SG2709 500/063


Out of stock

A wonderful example of this hard to find model by Alpha. These were issued to commemorate the jump-hour watches of the 1930’s-1970’s.

These watches are much bigger than their vintage predecessors. The case measures 30mm without counting the large onion crown and 48mm lug-to-lug. This particular watch is wearing one of my own superior gator-grain leather straps in tan. They can be purchased separately from eBay item number 401610646373.

This watch has been professionally inspected in-house by Loaltime and, as with all the watches that are handled by Localtime, the listed price includes a written 6-month written warranty from the date of purchase. Feel free to contact me for whatever questions you have.

Extra: Try my Localtime gator-grain superior calf leather straps: I have found them to be very comfortable and a great match especially for sport watches or chronograph watches that will combine well with this style of straps. They come in 5 sizes [16-18-20-22-24mm], 6 colours and have natural colour stitching. Their length is approximately 95mm on the buckle end [including the steel buckle] and 115mm on the tail end; so not short but not too long either. They are nicely padded, measuring 5mm thick at the lug end and they taper down to 3.75mm at the tail end. They have two keepers, one of them is fixed and the other one is floating. I have included many photos when you scroll down, so you can get a better idea of what you are ordering. A good quality pair of spring bars is included with each strap. Feel free to contact me for whatever questions you might have.

Important Note:¬†Sometimes I am asked what I exactly mean with ‘professionally inspected by Localtime’. Here is my theory on vintage watches: as a purveyor of vintage watches, my effort is to always do only what is needed to the watch. I do not buy ‘junk’ watches to resell. I am choosy with my purchases and always sell watches that are, to my knowledge, authentic and in good condition. I first inspect the watch, both visually (cosmetically) and then mechanically. If I judge that the watch is not yet in need of a full service then I do not put the watch through a service which, by the way, entails a lot of risks too. Instead, I give it what I call my ‘Spa’ treatment which will include a cleaning, changing of gaskets, oiling, lubricating and mechanical testing. If the plexi is heavily scratched or discoloured and it can not be cleaned, I change it. If the crown is wrong or worn, I also change it. Now, if the watch is in need of a full service, then my ‘professionally inspected’ description becomes ‘professionally serviced’. In both cases, I include a written warrantee with my buy it now price and I always describe what I have changed, if anything, on the watch.

Important Note On Straps/Bracelets: The straps I use on my watches [leather, canvas, suede, rubber] are always brand new, unless otherwise mentioned and, in most cases, I also sell them separately in my store, in different colours and sizes. In the case of metal bracelets, if the watch is NOS, the bracelet is also unused. If the watch is pre-owned with its original bracelet, then the bracelet is also pre-owned, unless otherwise mentioned. Either way, if in doubt, please ask.



Production Period

Modern (2000-present)


Jumping Hour







Case Material

Stainless Steel

Case Back

Stainless Steel

Case Size

30mm case without counting the onion crown. 48mm L2L

Lug Width



Pre-Owned & Working With Warranty

Last Known Service

Inspected by Localtime – May 2019


Free Worldwide


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