"Eventually Racing Mate branched out to performance parts, as shown in this vintage ad for a “sports kit” to modify a . They also had their own brand of lubricants, known as ."
Info from http://japanesenostalgiccar.com/; best website on Japanese classic cars.
Ok, let's talk about the watch. It was sold in 2014 by Jack Road, a cult watch shop in Tokyo, after spending its entire life in a bank vault. The watch is literally in New Old Stock condition. Considering how little of these "Racing mate" Monza's ref 150.501 were made I think it's not exaggerated to say that this watch is probably the best and rarest black pvd Monza out there. Also considering that the black pvd coating on these vintage watches is extremely easy to scratch finding one in NOS condition is almost impossible.
Enjoy the beauty of this superb watch with great racing history.