Deciphering Crown Numbers

Hamtramck Stan's picture

I am preparing to work on a 1953 Unknown with a 21 jewel 10BM. However, it needs a new crown.

Looking at the regular crown numbers in yellow, there's an 1122, 1124, and an 1126.

What is the difference between these three?

Daca102090
Posted February 6, 2015 - 5:22pm

1122 is 5.40mm in diameter, 2.25mm thick overall

1124 is 6.00mm in diameter, 2.45 mm thick overall

1126 is 4.85mm in diameter, 2.45mm thick overall

bobbee's picture
bobbee
Posted February 6, 2015 - 6:22pm

Hamtramck Stan's picture
Hamtramck Stan
Posted February 6, 2015 - 8:59pm

Thanks much for the replies as thus helps out tremendously.

The chart is very helpful. Curiously, it doesn't include 1011 or 1012 that are listed in the interchangeable parts catalog.

Thanks again!

1955mercury's picture
1955mercury
Posted February 6, 2015 - 11:01pm

The chart Bobbe listed was printed in 1952, Stan. The crown part numbers 1011 & 1012 didn't exist then. They were first listed in the supplement to the interchangeable parts catalog in 1959 but no dimensions of them were listed.

mybulova_admin
Posted February 7, 2015 - 12:40am

Club 5000Panel Member

 

A silly question perhaps..... What's the tap measurement?

1955mercury's picture
1955mercury
Posted February 7, 2015 - 1:00am

I don't know if this is correct or not. I found this on another site. I personally don't know.

Measure the diameter of the stem:

  .60 mm =  No. 13

  .70 mm =  No. 12

  .80 mm =  No. 11

  .90 mm =  No. 10

 1.00 mm =  No.  9

 1.10 mm =  No. 8

 1.20 mm =  No. 6

 1.30 mm =  No. 3

Hamtramck Stan's picture
Hamtramck Stan
Posted February 8, 2015 - 9:27pm

I genuinely appreciate the specifications.

By the way, I have been curious about the name "1955 Mercury". It is either the car (Medalist, Monterey, Montclair, etc.), or it's in reference to a 1955 Timex Mercury watch. If it's the car, which series and model do you own thing for(even though this has not much to do with Bulova watches!)?

William Smith's picture
William Smith
Posted February 8, 2015 - 9:36pm

Club 5000Panel Member

As long as we are deciphering stuff, I thought 1955mercury was a much friendlier name than " 2.57236858atm "

1955mercury's picture
1955mercury
Posted February 8, 2015 - 10:35pm

It's in reference to the car. I have one 55 Monterey, two 55 Montclair's and one 55 Sun Valley.

Hamtramck Stan's picture
Hamtramck Stan
Posted February 8, 2015 - 9:28pm

Whoops! Didn't proofread before hitting 'save'!

Hamtramck Stan's picture
Hamtramck Stan
Posted February 9, 2015 - 4:10pm

I have see a lot of '55-'56 glass roof Crown Vic's (the former original Skyliner) but never a '55 Sun Valley. Has to be quite rare! And I grew up, and live, in the metro Detroit area (even belonged to the Ford-Mercury Restorers Club), and still never have seen one.

1955mercury's picture
1955mercury
Posted February 9, 2015 - 4:18pm

I was told that Mercury made 1180 of the 55 Sun Valleys by a vintage Ford collector.