I just picked up this coin. Though clearly unofficial, it was listed in the auction as official. It is also from the Nether Compton hoard.
auction description---
Constantine II. As Caesar, AD 316-337. Æ Follis (16mm, 1.53 g, 6h). Lugdunum (Lyon) mint, 1st officina. Struck AD 330-331. Laureate and cuirassed bust right / Two soldiers standing facing one another, each holding spear and shield set on ground; two signa between; •PLG. RIC VII 244. Brown surfaces. Good VF.
Ex 1989 Nether Compton (Dorset) Hoard.
"This massive hoard of 22,670 Roman coins was found by Mike Pittard while metal detecting in a field near Nether Compton on 19th February 1989. The field is by the side of a trackway, the other side of which is a known Roman building. The actual finding of the hoard was photographed and report was published in The Searcher magazine (Issue 44, April 1989). The hoard was deposited with the Yeovil Museum by the finder in 1989. It was subsequently returned to the finder, sold, and dispersed through the trade in 1994. No detailed record was made of the content of the hoard. The Pottery vessel and some 33 additional coins that had remained stuck to the pot were donated to the museum and remain there. Although Nether Compton was never recorded or published, a limited amount of information has been gleaned from people who have handled it or part of it. It was a very large mid-Constantinian hoard and typical in composition, all but about 7% consisting of the very common bronze issues of the AD 330s (the Urbs Roma and Constantinopolis commemoratives and the Gloria Exercitus Type in the names of Constantine I and his sons). There were no coins of the two Victories type suggesting that the hoard was deposited around AD 339."