The refill is M medium, which provides a smooth writing experience. The included refill can currently be written with, but it is not clear how much is left. Many 161 models have a hard pull, so It has been overhauled and all screw parts and the second generation extension mechanism have been greased. If you look closely you can see some small scratches, but I think it's in pretty good condition.
Once you use it, you will realize that this is a Montblanc pen. Pen Features Material Oil-based ink, twist-type. We also sell this product on a Japanese e-commerce site, so there is a possibility that it may be out of stock depending on the timing. Also, please understand the product details carefully before purchasing.