From 1892 to 1897 Alfred Smith & Co. were using envelopes with a coloured vignette of their office in Bath, starting with a vignette in red. These two are from September and November 1893.
The next colour was green, though the top one is either olive green or grey. The top cover is from April 1894 and the bottom one from March 1895. The company is now Alfred Smith & Son.
These next two covers are both dated 24th April 1896.
The next cover is from March 1896 and Alfred Smith & Son are now Dealers in Postage Stamps for Collections, and have the Alfred Smith & Son's Monthly Circular. The bottom cover from January 1897 shows the move of the premises to London.