I have Pulsar PH8311X1 ladies watch. Is it have a screw in crown model?

Question edited for clarity

Presumably the '851237' is the serial number? That is never mentioned in sales details.

Click the link and then the images tab. That should show yours and a sales details. Another way is to look on eBay and check 'Sold' listings.

https://www.google.com/search?q=Pulsar+Quartz+ladies+watch+851237

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The value of your Pulsar Lady's Pulsar watch with an 18k band varies greatly depending on its overall condition, features and history. Generally speaking, the average value of this watch is estimated to be around $400 US dollars. However, the price can fluctuate depending on the details of your watch and it is suggested that you contact a specialist or appraiser to get the most accurate value.

$20

https://www.google.com/search?q=ladies+pulsar+watch+serial+number+is+381014

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Doesn't appear to exist 'PG' would be correct but not 'PPG', and model numbers end in an 'X', not an 'S'. If you bought it online, it is likely a counterfeit made in China.

https://pulsarwatches.com.au/collections/watch-finder/

http://www.newdwf.com/viewtopic.php?f=79&t=8617

They are a nice watch, but not 'high end' and values reflect that.

https://www.google.com/search?q=pulsar+ladies+watch+value

Pulsar Europe

https://www.pulsarwatches-europe.com/

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The model should be stamped on the back plate. Can't help you by looking at a photo of the watch.

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know it just pulls out

A standard ladies rolex should have just one stem and crown on the side. Occasionally the crown is a screw down crown. Try to pull the crown out if it does not pull out try to pull and unscrew it at the same time. There are two settings one you pull the stem all the way out and that should set the time, if there is a day or date setting, you push the stem halfway in turn one way for day and other way for date. Please let me know if there are any other buttons on watch thank you!

Yes, you must always screw down the crown. If not, you will get dirt, sweat, water inside and it will cost alot of money to repair

Most good dive watches with a screw in crown need the crown to be pushed in and turned clockwise AT THE SAME TIME in order to screw in the crown fully and make the watch watertight.

When you want to adjust the date or time, you just rotate the crown counter-clockwise until it pops out a bit. If you gently pull the crown out to the first position you can turn it to adjust the date. If you pull the crown out farther, to the second position, then you can turn it to adjust the time.

Never take your watch into the water unless the crown is fully screwed in finger tight or water will get into the watch movement compartment and ruin it.

Good luck, hope this helps.

To set the timer hand on these models of Pulsar watches, do the following: 
Looking at the face of the watch, there are two buttons and a crown on the right side. The TOP button is Button "A". - The BOTTOM button is Button "B".
There are 3 positions on the crown: IN (#1), FIRST CLICK (#2) & SECOND CLICK (#3).
First, pull the crown out to the second 'click' position (#3) ... This is all the way out. (STOP THERE! Pulling harder will harm your watch! Don't try to pull past position #3!)
Push and hold Button "A" for two (2) seconds. The dial will sweep around to the 12 O'clock position. You can advance the timer while the crown is in position #3 (second click out) to reset it back to the default position. 
The manual says that if you pull the crown out to position #3 while the timer is measuring, the hand will reset back to the 12 o'clock position... I haven't tried that, so I can't confirm.