For all those who think that the US couldn’t produce great watch movements, I present the Bulova 5AD, a little masterpiece of American watch making.
Paul from WatchOtaku.com sent it in, and it doesn’t work at all.
The movement is 13mm x 15.2mm, so pretty tiny. Here it is on a 1p coin. Now have a closer look. 23 jewels, and third, fourth and escape wheel have cap jewels, all beautifully executed in one triangular cap. The movement is in exceptionally good condition, and a beauty.
The movement dates from around 1960, according to Ranfft, and has a properly poised and temperature adjusted balance.
The gear train. There is a change of alignment for the escape wheel, which enables to the balance, pallet fork and escape wheel to be in one line.
The bottom plate with the cap jewel for the balance on the right, and a double cap jewel for escape and fourth wheel on the left.
All clean and ready to go.
I re-use the old mainspring, as it’s pretty spritely.
Just to give you an idea of scale – putting back the cap jewel on the balance cock.
Back together and beating.
As you would expect from such a small movement, you don’t get a straight beat rate, but a bit of an up and down. Nevertheless, very good for the age and size!
10 to 5 – time to call it a day!