Ĉi tiu broĉo estas el alia epoko.

Ĉi tiu means this.

It is made of:

• tiu = that
• ĉi = a particle that makes it mean this instead of that

So:

• tiu broĉo = that brooch
• ĉi tiu broĉo = this brooch

You may also see tiu ĉi, which means the same thing. Both are correct:

• ĉi tiu broĉo
• tiu ĉi broĉo

A rough English guide is:

• ĉi ≈ chee
• tiu ≈ TEE-oo or almost tyoo
• broĉo ≈ BRO-cho with ĉ like ch in church

A few key points:

• ĉ is always like English ch
• o is a pure vowel, like o in Italian or Spanish, not a diphthong
• stress in Esperanto usually falls on the second-to-last syllable

So:

• broĉo → BRO-cho
• epoko → e-PO-ko

In Esperanto, nouns normally end in -o.

So:

• broĉo = brooch
• epoko = epoch / era

This makes it very easy to recognize parts of speech:

• -o = noun
• -a = adjective
• -e = adverb
• -i = infinitive verb

Alia means other or another, and it is an adjective. Adjectives in Esperanto end in -a.

Since it describes the noun epoko, it must be in adjective form:

• alia epoko = another era

Compare:

• alia = another, other
• alie = elsewhere / in another way

So alie epoko would be wrong, because alie is an adverb, not an adjective.

Because this phrase is not a direct object. It comes after estas and is part of the predicate.

In Esperanto, the -n ending is usually used for:

• direct objects
• sometimes direction

Here, alia epoko is simply part of the meaning from another era, so no accusative is needed.

That is why we get:

• Ĉi tiu broĉo estas el alia epoko.

not:

• Ĉi tiu broĉo estas el alian epokon.

El usually means out of, from, or made of, depending on context.

In this sentence, el alia epoko means from another era.

So el is expressing origin or source, not physical motion. It suggests that the brooch seems to belong to a different historical period.

You can compare:

• el ligno = made of wood
• el la domo = out of the house
• el alia epoko = from another era

That is a very common question.

Both el and de can sometimes be translated as from, but they are not used in the same way.

• el often means out of, from inside, or originating from
• de often means of, from, or by, especially with possession, authorship, or a more general source

In el alia epoko, the idea is that the brooch seems to come out of or originate in another era. That is why el sounds natural here.

Examples:

• libro de Maria = Maria’s book
• mi ricevis ĝin de ŝi = I got it from her
• vazo el vitro = a vase made of glass
• objekto el la mezepoko = an object from the Middle Ages

It can be either, depending on context.

Literally, it can mean the brooch is actually from another historical period.

Figuratively, it can mean the brooch looks very old-fashioned or seems to belong to a different age stylistically.

English does something similar when we say something is from another era.

Esperanto has no indefinite article. There is no separate word for a or an.

So:

• broĉo can mean a brooch or just brooch, depending on context
• alia epoko can mean another era

Esperanto does have a definite article:

• la = the

But there is no equivalent of English a/an.

Yes. That is completely correct and means the same thing.

Both of these are normal:

• Ĉi tiu broĉo estas el alia epoko.
• Tiu ĉi broĉo estas el alia epoko.

Learners often meet ĉi tiu first, but tiu ĉi is equally grammatical.

The structure is:

• Ĉi tiu broĉo = subject
• estas = verb
• el alia epoko = prepositional phrase describing the subject

So the pattern is essentially:

This brooch is from another era.

Word-by-word:

• Ĉi tiu = this
• broĉo = brooch
• estas = is
• el = from
• alia = another
• epoko = era / epoch

Yes. Epoko can refer to a period of time, and in many contexts English might translate it as either epoch or era.

In a sentence like this, era often sounds more natural in English:

• This brooch is from another era.

But the Esperanto word itself covers that general idea of a historical period.

Because Esperanto often uses a simple to be + prepositional phrase structure where English does too.

So:

• estas el alia epoko = is from another era

This is natural and idiomatic Esperanto. You could sometimes rephrase ideas in other ways, but estas el is straightforward and correct here.