It looks good to me. The owner of this shop is the most thorough authenticator I know of. Every piece he sells is painstakingly examined. Usually he can pinpoint exactly where something came from... even items that are over 100 years old! Easily the absolute best in the business.
Thanks to everybody who replyed to my enquiry. I have now purchased the item. I thought that I could trust the seller, but know by past experience even the best sellers in the world can sometimes get it wrong so I always value a second opinion.
Earlier in the year I almost purchased a Harrison Ford signed item from Ed Bedrick (a dealer I trust 100%) and decided not to because there was some question as to its authenticity after I enquired about it on this site.