P. murinus

1" is gonna be too small to get an accurate guess IMO. Vent-sexing is already dubious at best, let alone with such a small specimen. These guys grow fast though, you're better off waiting and trying again after a few molts.

@Arachnophoric I am still new to the hobby so I am still learning. I appreciate it! Would you say try again when it gets about 2.5-3 inches?

@Prat7 There's an old forum post about sexing pokies that can be found here: http://arachnoboards.com/threads/poecilotheria-ventral-sexing-vs-dorsal-sexing.159558/
Your specimen might be too small right now to sex ventrally but when he/she gets a little bigger, perhaps your answer can be found in here.

@Prat7 Yes, if you can't get a good molt to sex by that size, any attempts at ventral sexing would be much more accurate than currently.

@Prat7 http://arachnoboards.com/gallery/pterinochilus-murinus-ventral-sexing.51459/

I'm an idiot and saw the P. in the genus name and just assumed it was Poecilotheria, not an OBT. Whoops.
Ignore that first post, this one may be substantially more useful since it's actually the right genus this time.
I really need some sleep lmfao.

I have 8 that I raised from that size 6 being female, 2 being male and at that size all looked identical. Even now at 3.5-4" you almost cannot tell a difference at all between them ventrally. The males resemble females alot at least mine do..

Just checked this for the first time since the first reply and wow! Thanks for all of the info I wish these guys were like my L. nigerrimum where after a couple molts you can tell if its male or female