This is a recently printed commemorative cachet on an original FDC for #1145 by CEC. CEC is marketing these on eBay and at their website. CEC claims that he has been collecting FDC since the early 1960s, but didn't start making FDCs until the 1980s.
Cuv Evanson is a "nom de plume" for Peter R McClure of Woodbridge, Virginia. It's a name his Father used to answer a child's question...Who was that on the phone? Dad...no matter who it was...it was always "Cuv". Later on, it became a family joke to use "Cuv Evanson" to keep a phone caller a "secret". He uses the name in fond memory of his Dad and his sense of humor.