1/2 Poncirus, 1/2 Clementine
or
1/4 Poncirus, 1/4 Temple, 1/2 Clementine
'The common tangerine is the hardiest of the dessert citrus, and was a possible source of genetic material. The first attempt was Clementine x P. trifoliata, and these survived, at least in Franklin at 0°F (-17.8°C)and in Houstion at 5°F (-15°C)to fruit following the freeze of 1989. They seem to be hardy to five degree above zero. Several siblings, 'Dimicelli', 'Backyard' and 'Hardy Fruitful 90 have received the dignity of names.' [1] page 14
'Is Ciclem #3 (if I remember correctly which is another cross of Citemple x Clementine like Ciclem #10).' (personal correspondence)
The leaf type suggests the latter.
Seedlings are at least partially zygotic with differing leaf shapes (but not trifoliate) and varying cold hardiness.