Would you be able to provide an image? This is silver plated and they tend to sell for up to $40 - $50. I would need to see images to determine the date though.
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IS, or International Silver Co is a known for producing primarily plated wares. As well, the lack of the workd 'sterling' or '925' is also a primary indicator.
Texting photos is an additional fee, the number you may have contacted is a landline. I can send the premium services offer if you like.
As well, there may be an +Add Files button or if there is a toolbar with a paperclip icon showing above the box where you type in responses, then follow the steps on this link for sharing photos:
You can try emailing your images to *****@******.*** and write “For Nora/Antiques” in the subject line of the email.
Photos sent by email do not arrive to me directly nor instantly, they get forwarded to me by admin.