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Assuming it was made in Barcelona for that region I'd recommend looking at period literature on the RF spectrum there. Those channels may have originally been for some public service like police 2-way radio placed in the middle of the TV band that later moved to different frequencies and got repurposed into TV channels. If the TV channel numbering was around long enough when extra midband channels were added it would make sense to give the new channels letters rather than disturb existant branding and make tuning old sets confusing.
Another possibility is those channels never carried TV in that market, but it was cheaper to buy a tuner made for many countries and give the channels not used in the area letters corresponding to their non-TV use.
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