M5 switch question

[kiwieod]

are these M5 pressure release switches correct for this box?i have seen anodized ones as well
what era is this box? I would think 60s,70s?
why would the coupling bases be dummy ones?
this box was opened when I got it

 

[US-Subs]

In the US M5s were still available into the early 90s. Stocks were being used up as the M142 was slowly replacing them. I've never seen the dummy base couplers, but we used to get replacements in 50 piece boxes. I'd wonder if yours were added afterwards, the box should have indicated if it had dummies -

 

[kiwieod]

yes your right if they had dummy primers the box would definatley be marked.