7AM

Start Year
1937
End Year
1946
Jewels
7, 15, 17
Andersok
Posted September 8, 2014 - 4:22pm

1945 - 17 Jewels

1955mercury
Posted November 26, 2014 - 8:37pm

I've got 3 ladies model Bulovas with 7AM movements and none of them have a seconds hand.

denupnorth
Posted November 26, 2014 - 4:24pm

Does this movement have a center seconds hand?

denupnorth
Posted November 27, 2014 - 10:09am

Was this movement only used in ladie's watches?

Reverend Rob
Posted November 27, 2014 - 10:27am
 

7.75''', based on ebauche  AS 1001. The 7AMC had the sweep second hand. 

Ozme
Posted August 6, 2015 - 9:02am

I'm faced with a bit of a conundrum. According to all accounts this was the movement in the early '40s Nightingale, which prominently advertises a center sweep second hand, but if this movement didn't have one, then what's going on with the examples on this site and Watchophilia?

William Smith
Posted August 6, 2015 - 2:11pm

We probably got something slightly wrong over the years. I'll check it out.  Agreed that models advertised with sweep second hands should have a movement w/ that complication, if you will.

William Smith
Posted August 6, 2015 - 3:21pm

We have several 7AM's w/ the sweep second complication on site. Dr Ranfft doesn't list the 7AM, but he has several 7's listed on his site.  Most of those which are "close" to 7AM have a sub second, which can pretty easily be modified to be a sweep second and for what ever reason, the "C" part of the 7AMC wasn't stamped on the bridge for some of these perhaps earlier movements w/ sweep second.



Here's Jab's 1943 17 jewel example from this 1944 American Nurse record.

We also have a 1946 7AM w/ sweep, from this "non-conforming" record, so maybe it wasn't just the older movements which didn't have the "C" part stamped on bridge.

rtwatches
Posted February 18, 2018 - 2:07pm

 

 

 

This 7AM has what appears to be a refinished dial and no exposed 4th pinion for the second hand.

For some reason the 7.75 ligne Bulova 7xx movements are no longer on the Ranfft website.

This 7AM looks very much like a 7BS I have:

Reverend Rob
Posted April 3, 2018 - 3:47pm

Not all 7AMC's are stamped as such, some are simply 7AM with the centre sweep pinion. The same goes for the 7AS and 7ASC.

In addition, the 7BS, 7BSC, 7AD, 7ADC, 7WM, 7WMC are all from the AS 1001 ebauche. 

Kathy L.
Posted April 16, 2018 - 6:37pm

I have a 1943 without a second hand and one with.