The De Vere 504 is a 5x4 inch large-format enlarger built by the British manufacturer De Vere for darkroom use with sheet film negatives up to 5x4. It was aimed at professional and advanced amateur darkrooms, with a rigid column and interchangeable light sources making it a workhorse rather than a consumer product.

At UK auction today, hammer prices for the De Vere 504 have spanned roughly £180 to £530, with a median around £340 across the recent sales on record. Values at saleroom level depend heavily on completeness — a 504 with the correct lens, condenser or colour head, negative carriers and baseboard sells for noticeably more than a bare chassis, which is why the price range is wide and condition-sensitive.