I haven't checked yet but you could possibly check old Argos catalogues by way of narrowing the search by year of back issue and when you think the photo was taken.
It probably won't identify the model number but rather give you a visual of the popular models and supplier you likely may of received it from. I'll suspect most people's relatively cheap digitals of the 80's and 90s were bought via Argos or Index .
https://issuu.com/retromash
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