From the listing (the bold emphasis is mine):
Darrell Hyde was known throughout Star Trek Prop collecting as a TOS Phaser Expert. Darrell passed away in 2008 from complications of the flu. Darrell Hyde was known as “Phaserfetish” on numerous prop boards. He passed rather young in his 40’s and was survived by a Wife and Son.
Darrell was also an acknowledged expert on so-called “Mark English” Phaser "fakes".
The irony of this statement being made in this listing by this seller is staggering. Too bad Darrell isn’t here to help sniff out some modern fakes.