Well in terms of valuation, we have something of a dilemma.
A Google search will discover various outlets advertising such items in the low thousands of pounds. Perhaps a more realistic appraisal would be reached by doing a search of upcoming auctions that are advertising cocktail cabinets for sale.
Please go to Antiquestradegazette.
Scroll down to a box on the left called The saleroom.. Click there and do search. You will find cocktail cabinets made between the 1930s and the 1960s approximately.
The valuations will be conservative of course and many will exceed their lower estimate.
Your cabinet looks like walnut and the veneers have been 'halved and matched' to produce the mirror image patterns. This was common from the 1930s onward.
The fact that yours is a good make and is veneered in well figured timbers does raise it from the ordinary. Nevertheless, I would expect a pre-sale estimate for your item of no more than £300/500.
These items are not seen as desirable by most young people setting up homes and there are quite a few that are coming onto the market as houses put together years ago are being sold on.
I do hope that helps. You really do need to ignore the prices asked by online businesses. they can (and do) ask any price they choose. As commercial outlets they can get higher prices than you might expect. Greg