Two comments.
1) The supposed six-foot hoist dimension looks very much in scale with the double doors in the background. I have no prolem with the 6x10 dimension.
2) Anyone who has been watching ACW era flags on eBay should be suspicious of any flag with a stenciled motto or slogan. However the copy on this flag is way bigger than any stencil I have seen used on modern fakes (beg pardon, I meant "decorative reproductions.")