From what I can research I believe that represents Holland, Aldwinckle & Slater. Each link is stamped with. 375 as well as 9, again representing 9K solid gold.
The chain has a tapered curb link design. The end links start at. The chain measures 12 from end to end and weighs 27.8 grams.This is one of a number of items being liquidated from a jewelry/coin store we had for over 37 years. Check out our other items! We apologize for the inconvenience. The item "Antique 9K Rose Gold Pocket Watch Chain 12 withT-Bar 27.8g Tapered Curb Link HA&S" is in sale since Thursday, October 17, 2019. This item is in the category "Jewelry & Watches\Watches, Parts & Accessories\Watch Accessories\Chains & Fobs". The seller is "wilmorecoins" and is located in Irwin, Pennsylvania. This item can be shipped worldwide.