HI, ( PLEASE READ AS THIS IS COLLECTION ONLY I WILL NOT POST) THIS IS A SCRATH BUILT MODEL OFF THE NEPTUNE SUBMARINE SB1 THAT WAS SOLD BY THUNDER TIGER, THIS ONE IS THE NEPTUNE SB2 THAT WAS SCRATH BUILT BY ( GRAHAM WHITE OF MODEL WORLD.)  IT WAS NOT IN KIT FORM AND SOME OF THE PARTS HAD TO BE FABRICATED AS YOU JUST CANT FIND THE PARTS ANYMORE, EVERYTHING IS THERE AND ALL THE PARTS WORK BUT UNFORTUNATELY IT AS NEVER BEEN WATER TESTED AND DOSE NOT COME WITH A RADIO BUT I DO KNOW WHAT CRYSTAL IS IN IT, CASH ON COLLECTION ONLY AS WILL NOT POST,  HAPPY BIDDING AND GOOD LUCK.