Hmmm, I'm not so sure it is dodgy. I know at Collingwood there were players that preferred the older style cotton/acrylic jumpers rather than newer polyester/sportswool types. It was not uncommon for players to use jumpers from previous seasons and have the logos replaced. Pretty sure Damien Monkhorst was one of these players.
The badge on this jumper does not appear to be the standard sew on centenary patch which appeared on all jumpers where a sewn on patch was used (and that has appeared on eBay from time to time), i.e. Collingwood, Carlton, Fremantle, etc. But rather it has been produced to replicate the logo on the jumpers that had the logo sublimated onto the jumpers, i.e. WCE, Brisbane, Hawthorn. (Puma Clubs)
This is all just an assumption, but the slight difference in logos leads me to think that this jumper may have been produced for WCE in the instance a player preferred an older style jumper and so that logo matched the rest of the team.
Yeah I remember seeing on the eagles flying high site a while back someone had a centenary PI that was woolen and he said you could see where the afl logo was taken off and the centenary one put in its place, that eagles one shown is obviously a retail version so maybe sekem did the same, said it was heat pressed on too so I spose they are not trying to be dodgy just explaining it as is. The logo itself is the same as the sublimated ones as said before so looks legit in that sense.