Selecting replacement crystal for 7009 Seiko (bad reference)?

[onshi]

I have a Seiko automatic with "Seiko 5" printed on the dial, English and Arabic text on the day wheel, and reference 7009-5330 stamped on the caseback. The crystal is quite "tall" and in good condition except for a significant  7.5mm crack around the circumference of the crystal from approximately the 2 o'clock to 3 o'clock positions. Unfortunately, the way light plays across the crystal makes this crack quite visible and I suspect it is getting larger over time.

I know the reference number is wrong, as images for 7009-5330 do not match this watch case's shape at all.

So, I know this watch's original caseback has been replaced. and I also lack an accurate reference to help me identify a replacement crystal. I also doubt the dial is original, but I like it a lot! I'm actually not too fussed about non-original/matching parts here. In fact, I don't care at all. I just want a new, durable crystal that should fit so I can attempt replacing it.

In these circumstances, how would you proceed? By measurements alone after removing the damaged crystal, or by some other means?

 

 

[Graziano]

Hi there, welcome to the forum. Youtube have plenty of videos on crystal replacement this link should get you started. You are going to need a crystal press or crystal lift depending on type of crystal you have. More than likely it will have a seal as well that may need to be replaced. 

 

Edited January 31, 2021 by Graziano

[jdm]

13 hours ago, onshi said:

By measurements alone after removing the damaged crystal

Correct. Having the very exact Seiko P/N is not much important on replacing a crystal, especially on a watch made of assorted, non original parts. 

A crystal press is needed as already mentioned. In my experience, unless visibly damaged, the gasket can be left in place. 

[onshi]

Thanks for these answers. I have a crystal press en route and intend to order a new one based on measurements once I have it out of the case. A few of my watches are likely to get the same treatment in the coming weeks...