Help dating a backless DB morning waistcoat

[JAH]

Hi all,

Does anyone have any ideas about this waistcoat? It's backless, so must be post-1923 (though I think it's probably much later than that anyway), it has what looks like would have originally been four buttons for a slip (only one remains) and the buckle reads 'SOLIDE'. Thanks!

 

[Dirk Wainscotting]

Laid-on lapel style, could be 1950s.

 

[JAH]

Thanks! What do you mean by laid-on lapel?

 

[Dirk Wainscotting]

Not cut-on like a coat; the lapel is made up and attached later.

 

[AlmostDecapitatedByMyCollar]

Could you please help me dating my own double breasted waistcoat: http://www.thefedoralounge.com/threads/identifyng-a-db-waistcoat.90009/