Depends on the condition. The street price for the Gibson J-45 Legend 1942 is $6,200. Gibson 1942 J-45 Vintage Sunburst Acoustic Guitar In great condition you will spend upwards of $4,500 for the guitar. Some people will sell them for less if they are in a hurry to sell.
I tested all the tunings against my two Korg tuners. Both of Korg's give the same results. Strings are sharp or flat in standard tuning. Admittedly, strings are only about tuned since the pressure from the pick or fretting finger can throw things off. I found the best way is to strum each string in succession, not to slow, and do it about three times before the lights go blue. Still not perfect.