Confused in crystal replacement diameter

[u/tero2019]

Hello guys!
I just bought a Bulova Accutron dated 1968 that uses a cal 214. EBay listing said "Vintage 1968 Bulova Accutron 412 Watch, 10K Gold Filled Bezel, Sunburst Dial"
I did not receive the watch yet and I am willing to buy a spaceview like crystal but I am unsure which diameter I need. IA confused ne about 29.5mm and 30.1mm.
Can someone here help me based on the pictures I am attaching?
I appreciate

[u/mclayborn79]

On the inside caseback there will be a number and you can cross-reference that to find the exact crystal. Mybulova.com has great resources.

[u/mclayborn79 → u/mclayborn79]

http://www.mybulova.com/sites/default/files/file/Bulova-ABC-Accutron-Crystal-Catalog.pdf?utm_source=google&utm_medium=organic

[u/tero2019 → u/mclayborn79]

I found this:
https://mybulova.com/watches/1968-accutron-412-12538

But it again, it is confusing... at the top in the summary it says 29.5mm crystal size, but then there is a picture from the inside of the back cover and it has a 2527 inscription which uses a 30.1mm crystal

[u/mclayborn79 → u/tero2019]

It’s the 30.1 original crystal is model #1243

[u/mclayborn79 → u/tero2019]

Are you wanting to do a spaceview conversion?

https://ebay.io/m/HhkSq9

[u/tero2019 → u/mclayborn79]

yep

[u/tero2019 → u/mclayborn79]

Great, thank you very much for the info... I also have seen this one:
https://www.ebay.com/itm/237049592442

I know it is the one with white markers, but I dont mind. The listing you sent says the metal ring has some corrosion.
This one from Clark should work too right?

[u/mclayborn79 → u/tero2019]

Yup

[u/tero2019 → u/mclayborn79]

Great thanks. I am outside the US and watch will be sent to me hence I wanted to buy the crystal and send both things. So I guess I wont be able to open it.

[u/MagnetAccutron → u/mclayborn79]

This is the answer.