These are new-old-stock vintage 3+3 guitar tuning machines made 50 years ago by Amati (Graslitz, Bohemia) for the production of Cremona cooperative and also Jolana guitars. They are in great shape (as they have never been used before and stored in a warehouse for the whole period) and will work great for both slotted and plain headstocks, please see measurements in the picture. They will be great for relicing purposes too, since they are nickel plated. The price is for one set (6 pieces).

Please take a look at my other listing, as I have a variety of other high-quality NOS tuners listed.