Chinese/Japanese Blue and White Tea Pot Dragon Pattren

Well it just amazes me what turns up at our local boot sale on sunday gone 30th July I was walking round looking at the stalls poor turn because high winds and rain i came across a tea pot blue and white with Dragon pattern ,Brass handle ,marks on the base but no lid so ask how much the man said £1 Uk money because it had no lid so i said yes ,i paid the guy and was walking away when he started shouting for me to come back to his stall only to be handed the lid he had found it in another box and while talking to him he said it had come from his uncle,s house and thats all he could tell me but he did say his uncle travel a lot in the far east !
Would love to know what the markings say on the base ?
Any help to Identify would be appreciated.
Thankyou
Colin