For what it's worth at this later date: the Sonata under discussion is apparently not by Mozart, but rather by one Anton Eberl. The following information courtesy of the Mozart Forum:
Issued by Artaria as Mozart's Op.31 in 1794 and by Andre as Op.47 in 1795; Pleyel added Violin and Cello for Paris issue of 1797; Artaria published Sonata in 1798 as Anton Eberl's Op.1 dedicated to Madame Madelaine de Jacobi; On July 15, 1798 Eberl gave notice in Hamburg paper he was author of 3 works printed as Mozart's.
And the following from Wikipedia's own commentary:
There was no composer whose works were more frequently passed off as Mozart's than Eberl. Even more surprising was the documented fact that there was no protest from Mozart against the use of his name on Eberl's compositions. Eberl, a friend and student of the great man, did mind but was too timid to take action until after Mozart had died. Finally, he published the following notice in a widely read German newspaper, "However flattering it may be that even connoisseurs were capable of judging these works to be the products of Mozart, I can in no way allow the musical public to be left under this delusion." Despite this, his works still continued to be published under Mozart's name.
There is an apparently PD download of the piano solo-plus-added-parts version (identified as Eberl's Piano Sonata #1) on scorser.com. Otherwise, Christopher Hogwood's HH Publications has issued it as HH175, although the distributor of Hogwood's editions seems to be affiliated somehow with Schott, although I see no listing in the Schott catalog.
By the way, the scorser.com PDF shows no minuet; perhaps the 6/8 finale is the movement remembered fondly...