Hi Mike in Chesterfield..
I have a Yupiteru MVT7100 in good condition (functions OK, body good and clean) apart from loose battery cover, and intermittent loss of reception due to dodgy aerial internal connection I believe. I have modified Key Lock button to operate backlight on/off.
I am prepared to offer it to you at a reasonable price if you are interested, its better than 'spares or repair' if not 100% perfect. If so please PM me or reply here and we can discuss.
Thanx, Goldox.