So what's your plan? I'd be interested to know. I've never used a Naniwa 12k, but have you ever used a Shapton 16k? I find 10 very light laps on the Shapton leaves my razors quite smooth, but it'd all very subjective, isn't it? I normally do 20 on the Shapton for my Swedish razors. I'm no expert at all, but I'd bet a six pack of German beer that razor is Swedish...