Those are Dimes chairs because almost no one else in the 80's / 90's made a Continuous Arm with a Bamboo leg. The stub tenons on the base are not fully fitted into the stretcher, another detail that was pretty much unique to Dimes (done for speed in production, wasn't really desirable). Plus, that extended arm variation was unique to the Dimes form, its not an exact copy of the EB Tracy original.
What is interesting is someone went to the trouble to sand off the DR DIMES brand under the seat and re-stain the bottom. See the interruption in the planing on the seat bottom? It's been sanded off in the middle where the brand goes. Some stores 30 to 40 years ago would do that so they could private label them or spin a yarn about the chairs and thereby charge more than the other DR Dimes dealers. If all the chairs look like that on the bottom, that's exactly what happened.
The Keeping Room was the largest DR DIMES dealer in the world pre-2000. I personally handled thousands of those chairs over a 13 year period. We discontinued our relationship with Dimes in 2000.
Those chairs are really worn, finish-wise. Suggest you paint them, since they are VERY difficult to re-stain. Here's a re-paint I did of a Windsor bench two years ago.
https://www.myfurnitureforum.com/sho...=windsor+paint