You can get more for some Honma drivers than you can for an R1. There are Honma irons that sell for 4 grand.
Honma might be trying to cover their a$$. One one hand If they said it was a fake, and it turned out Not to be, and you sold it for XXX number of money, then down the line you found out it wasn't fake, you may have legal recourse, ect.
I also think that someone may have had nothing better to do than to copy a great looking club, and maybe try to pass it off as a original Honma, this of course is because of no serial number, then again, is it p[ossible that someone at the factory forgot to stamp the serial number..?
So...you gonna send it to Honma..?
4K is just for the irons, I think it's because they actually put some gold in the cavity.
They sue you
There are some great fakes out there these days, fake everything not just golf stuff. The lack of serial number wouldn't concern me. I've seen so many inconsistencies with things like that. Companies say it should be in a certain spot and it's not. Went through the same thing with Cleveland for used irons I bought on craigslist. They said serial number should be on a band on the 7i and only the 7i because they mix sets with hybrids in 6 and longer. The band on the irons I bought was on the 6. Several emails later the said it was a factory mistake. I took the grips off and the shafts were engraved Cleveland and had stickers. However another inconsistency was found. The set was supposed to have Traction 85 shafts and the shafts in the irons were marked CG16 100g. Several emails later they again admitted factory mistake claiming it was an early run that used shafts from the previous model. Had serial numbers in different places on Cobra gear I bought new on the same day.
Those factories are overseas with who knows what for QC. Most employ low wage workers manning machines spitting out hundreds of whatever every hour. Stuff like this comes up all the time with guitars. Years ago before guitar fakes got big I found some pictures on-line of factories in Korea. They were so unorganized it was amazing. Racks and stacks of half finished product on top of finished stuff. Workers using ancient hand tools. Everything was a mess, seriously looked like one of those hoarder shows on cable. I made the effort to find those because back then people would argue my brand is better than your brand and I knew that most of it came out of one or two factories, Samick and Cort regardless of how the guitar was labeled.
Only once saw one sort of like that which got left behind on the side of the green. I remember the medallion was a little different more like a half sun burst or cog? ala MG700. Returned it to the owner and they were not even concerned it was missing, very casual about the whole thing. Speaking of MG700 ...
Holy cow that is $4600 per club if I'm reading that correctly? Anyway on their website they give a warning about grey market and counterfeit clubs but I suppose that could just be standard disclaimer stuff.