I did order an MXR that seems to be from the 90s. This should be my starting point.I know you prefer the real thing but this one is doing the trick for me: Mosky 250X
Back then brand dealerships were closely guarded and highly competitive, very few music stores had more than one or two pedal lines so it was very common to have similar pedal types from differing brands that did not overlap. This was because the various brands were represented and sold through different distribution networks most often by a sales rep that visited stores in a region or state. MXR, DOD and ROSS are examples of these US brands before we saw the imports like Boss and Ibanez virtually took over the effects market. These were often aligned through instrument, amp or string manufacturer distribution networks. There were also several niche manufacturers that made "house brands' for different distributors that offered a wide range of music accessories known as "one stops". C. Bruno was a main one in Texas but there were several in different regions of the US. I would surmise it was much the same in the UK. The markets were limited so much before what we take for granted in todays 'world market'.
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With the DOD, after watching the hour long video that Josh from JHS did on them and reading up some more, It seems that it's impossible to say there is "The" DOD 250. The vintage ones were cobbled together with whatever components could be sourced at the time and no two units sound exactly alike.
Since it's a very simple circuit and the internet seems to claim that the 250 is like the D+ but with a bit more treble, I'll check out the D+ first and then decide if that is a rabbit hole worth diving into. Vintage units are available - and actually not that expensive considering what other pedals in my ever changing collection cost, but I am at the point where I am reluctant to spend that kind of money on a pedal that used to be cheap, was in and out of production for about half a century and is a very simple affair. It just does not feel right in my gut. But maybe the arrival of the pedal changes that.
The same goes for the Rat, by the way.