What is the value of a coin with georgivs v dei gra Britt omn rex one florin 1936?

Depends on the year (1937 - 1952) and the condition. In "Fine" condition, which is probably average circulated condition for this coin, values are about 15 to 25 cents (except for 1950, about US$2; and 1951, about $3). In Uncirculated condition (no wear at all), values range from about $7.50 to about $60. In Very Fine ("VF") or Extremely Fine ("XF") condition, the values fall between the ranges listed above - the more valuable dates are (in declining order) 1951, 1950, 1940, 1944, 1945, 1946, and 1939. Others are worth no more than a dollar or so even in XF condition. If you have a bronze British penny dated 1941, 1942 or 1943, it is a fake as none were minted during those years (although half-pennies were minted in quantity). If you have a 1952 bronze British penny, you have a very valuable coin (or, more likely, a fake), as the Standard Catalog of World Coins lists there being only a single example of this date.