What tool is required to remove this case back?

[Lc130]

 

It doesn't appear to be a snap on.

 

Thanks 

Charlie

 

[Poljot]

34 minutes ago, Lc130 said:

 

It doesn't appear to be a snap on.

 

Thanks 

Charlie

 

 

A SWISS army knife (not bergeon )

A side-view photos would be more helpful.

[Lc130]

The case back is flush with the case.  

 

[Poljot]

51 minutes ago, Lc130 said:

The case back is flush with the case.  

 

Read this page:

http://vintagewatchadvisors.azurewebsites.net/2019/07/06/how-to-remove-the-stuck-back-of-a-watch/

 

[watchweasol]

Hi that looks like its screwed on but I have seen backs like that which were snap on,  so lets assume its screwed on and requires either a key or a Jaxa set to remove it.  A cheaper alternative is to super glue a nut of you choice to the back and leave for a hour so its good and set. Now using a spanner on the nut unscrew the back. The nut can be removes using nail varnish remover and the back cleaned up. Another alrernative is the sticky ball pressed on the back and turned, even a rubber sucker pressed on and twisted might work. I have never known the nut method fail yet       If it assumed it is pressed on tight and the case knife wont shift it  a bezel /case back tool will do the job.         I have the red one and it works very well. available from cousins or ebay.