This partially lined jacket is in excellent condition with a two button front, four button cuff and dual vents in the back. The tag size is 42R, however, please take the time to compare my measurements with your own taken from a similar jacket that fits you well to help ensure a proper fit.  I take five measurements on a blazer, sports coat or suit jacket. 
 

28.5"   A)  Length (back bottom collar to hem)                                         

21.5"   B)  Pit to pit (lying face up flat, fastened)                                       

20"      C)  Waist (lying face up flat across top button, fastened)               

18.5"   D)  Shoulders (lying face down flat, seam to seam)                       

25"      E)  Sleeve  (shoulder seam to cuff) + 2" under cuff                                             

I will list the size according to the tag...if there is no tag I will measure the pit to pit and double it, rounding down.  So the actual measurement I took will be shown above...A, B, C, D or E respectively, but for example, if I measure 21.5" on the pit to pit...I will list those numbers next to B, (the pit to pit measurement) but, the listing title will reflect a size 42, rather than a size 43.  I have included an illustration, demonstrating the way I get my numbers.