What a great photo thread! And yes, the green thing is a puzzle...I present some clumsy Photoshopping.
The alloy bodied car #45 is indeed the Gemini Mk 3 Constructed by the Chequered Flag in mid 1960 and first raced on August 1st 1960 at John Davy Trophy, Brands Hatch by John Whitmore. The Mk 3 of which this was the only car built of this model, was raced through the remainder of 1960 by either Tony Maggs or Geoff Duke and finally at Boxing Day Brands Hatch meeting with Peter Ashdown behind the wheel.
The Mk3 was then shipped to the USA and this was the car Charlie Kolb won the Sebring Formula Junior race on March 24 1961 and which he continued to use in FJ races through 1961 and early 1962.
The Mk 3 has recently "reappeared" remarkably complete, having been racing in Florida since 1983 as an Autosprint car. A book on the Graeme Warner and the Chequered Flag is being written and with this and the reappearence of the car, we would like to identify the event. Interestingly, none of the recorded UK FJ race meetings we have found to date, list the race number 45 for the Gemini Mk3.
Can anybody identify the event please?