The strainer measures approximately 6 and 5/8ths inches long and 3 and 5/8ths inches wide.
The English silver manufacturer Hukin & Heath made an identical strainer with the number 3835. The retailer Asprey & Co. also sold a cocktail strainer in this design with the number 3835. Hukin & Heath manufactured wares for various respected and well known British retailers and I believe they manufactured this strainer for both Asprey and Dunhill.
I have seen this strainer design paired with an Asprey cocktail pitcher with the number 3867. The pitcher was designed with a shelf inside the top rim so that this strainer could rest on it. There was an opening in the rim which would allow the handle to extend out and sit on the handle.
This Hawthorne-like strainer has a coil that slips over the wire ring that sits on the plate of the strainer. In his 1892 patent, William Wright mentioned that the wire ring was disconnected at its ends to leave a space so the coil could be removed for cleaning purposes. This strainer, too, has a space in the ring to allow the coil to be removed for cleaning. Unlike a Hawthorne strainer, which spells out the word Hawthorne, the holes in this strainer are spaced to create floral designs.