The obvious one is the Crimean 'May they ever be united' with two sailors shaking hands. This also appears on plaques with the 'Dixon Co' impress. So could Dixon have made the mystery group of plaques? I've compared the transfers below. The left column shows a marked Dixon plaque. The centre and right columns have plaques with scrolled borders. Click on the images to enlarge and to move between the details.
We know that some potteries commissioned multiple versions of the same image to use on different wares. So we can't entirely rule out Dixon. All we can conclude is that these plaques are no more likely to come from the Garrison Pottery (Dixon) than anywhere else. So back to square one I'm afraid. If you have a jug or bowl with the non-Dixon version of this transfer, it could be really useful in helping to pin down other transfers used by this pottery.